"Monastery" usually means 'abbey of monks' but occasionally it can mean an abbey of nuns. So it is not sufficiently marked that an abbot is a (male) head of a monastery of monks. Cf. abbess. Andres 02:25, 29 October 2006 (CEST)
And perhaps it should be specified that this word applies primarily to Catholic monasteries. In the Eastern Orthodox Curch the heads of monasteries are hegumens and archimandrites.
Some heads of monasteries are called priors (though this word has other meanings as well).
I think the definitions should enable the distinction between those concepts. Andres 02:47, 29 October 2006 (CEST)